Proper posh bloke and slippery character (7)

I believe the answer is:

genteel

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'proper' is the definition.
(thesaurus)

'posh bloke and slippery character' is the wordplay.
'posh bloke' becomes 'gent' (both can mean a man. I am not sure about the 'posh' bit.).
'and' means one lot of letters go next to another.
'slippery character' becomes 'eel' (slippery fish).
'gent'+'eel'='GENTEEL'

Can you help me to learn more?

(Other definitions for genteel that I've seen before include ""Refayned"" , "Artificially polite" , "Exaggeratedly polite" , "Terribly polite" , "Fashionable" .)

I've seen this clue in The Sun.

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